- Joined
- Jul 8, 2017
- Messages
- 89
What is the difference between optional PM 8" High Precision 4 Jaw lathe chuck and the stock 8" 4 jaw chuck? Does it justify the $399?
I initially had a Chinese version 4J independent, was so crude and out of balance I could not get it past 400 RPM. It was replaced with the QMT 8" 4J independent and the difference was significant. Much better casting, even has balance weights on the inside, no vibration spinning it over 1000 RPM. Grind of jaws and movement was much better. It is worth the upgrade if you plan to use the 4J. Price is $380, I do not know if they give any credit if it is a substitution for the Chinese 4J. I guess you could always use the Chinese one on a rotary table.